You're misunderstanding. An app can be freely available outside of the App Store but still be signed: http://www.macworld.com/article/165408/2012/02/mountain_li

You're misunderstanding. An app can be freely available outside of the App Store but still be signed: http://www.macworld.com/article/165408/2012/02/mountain_lion_hands_on_with_gatekeeper.html http://www.macworld.com/article/165408/2012/02/mountain_lion...